In a wide-ranging interview, Packer (author of Knowing God and numerous other books) was asked about the variety of spiritualities abroad today. His response:
"There's a great divide between all the
spiritualities of the world and Christian because
Christian spirituality is at every point a relation to the triune God
of 
the Bible. Secular spirituality isn't focused on God, if God even
comes into it, but on me and my fulfillment. My self-discovery. My
inner peace. The more you look at that gap, the wider it gets. It's the
difference between self-centeredness and God-centeredness. It's
unhelpful, actually, that both sorts of concern are called
spirituality."
Read the whole interview.